Need soon is 99 points

which sentence contains a correctly used relative pronoun?

1) that assignment, which was due today, was very difficult.

2) i knew which she would never finish the race.

3) my sister, that lives in milwaukee, is going to law school.

4) my friend that wants to be a doctor is named cameron.

is that the whole question?

the correct answer is the following.

one of the groups i belong to is the boy scouts. this is a problem-solving group because it has tasks that we need to solve in order to other people in different activities such as the rescue of lost pets, or elder people in need.

the other group i belong to is kids pro environment, and is an information-sharing group that tries to create conscience about the risks and problems that generate pollution in our cities. we share information to other students and parents on the importance of keep our communities clean and our skies clear.